Slotting-machine attachment



May 31, 1927. .1 I 1,630,328

A. l.. BRUMBAcll SLOTTI-NG MACHINE ATTACHMENT *n FiledAug. so, 1924 z sheets-sheet 1 17h/11 L. Brmac kIN VEIY TOR.

A TTORNE YS.

May 31, 1927.

A. L. BRUMBACH SLOTTING MACHINE ATTACHMENT Filed Aug. so. 1924 T 2 sheets-sheet 2v /m'n Lmmdc/z INVENTOR. l

ATTORNEYS.

`:tactorily cutting .spaced slots which have onlythin walls of Operated un@ by the-tr Patented May 312;,1927.v r'

\ UNITED. STATES PATENT -pFlc'E .-ff

L. namen, or READING, rnNNsYLvANiA, AssIcNon To TExrmEimAcnINn'- v i wonxs, or wYomssrNe, PENNSYLVANIA, A conroaAmroN or PENNSYLVANIA.

' ,-sLoTTiNe-MAonINE ATTACHMENT.

Alipi'aarion' slee August so, 1,924.h semaine. 735,142.

Y vMy invention relates t slotti'ng machines; L

and my vmain object isto'provide for satisa succession of closely material between them.

A particular work in mind isthe'slotting of needle-bar or narrowing bar blanks for the reception ofthe needle shanks of full-V *fashioned knitting machines; in which case the close spacing of thelneedles'necessitates Avery, thin and 'correspondingly vweakened partition walls,V while at the same time calling for thegreate'st possible accuracy and uniformity in the needle-receiving slots. It has been found in practice that the fact that the slot-cutting tool is in each successive cutting movement flanked on one side by a wall of solidmetal and on the other by only a thin wall of metal separating'it from the previously cut slot, is apt to cause `undue lateral strain on each newlyv formed wall with resulting breakage or imperfection.'v

' To overcome this trouble I provide for au# tomatically supporting the thin wall formed in cutting each successive slot and for thereafter withdrawing such support to permitof the required step movement forthe succeeding cut; as fully set forth in connection with the accompanying drawings and clearly defined in the claims.'

Fig. 1 is 'a plan view Aof my attachment as' preferably applied; shown in connection witha merely diagrammatic indication "of the rotary-cutter and work-holder elements ordinarily employed in slotting machines.

A needle-bar blank is also indicated in posi-1 tionupon the latter, by dash-and-dot Fig. 2 is a corresponding elevation indieating,- partly in cross-section, the relative positions of the known' machine parts.

- Figs.' 3 and 4 are enlarged detail views 'of tfzillile slot-engagingxportion of the bracing.' er. f i 1 e-wellknown essential parts'of a slottinlmachine are only suiicie'ntly indicated to ow the relation thereto of my invention; the frame A of such a machinebeing crudely .indicated'jin dotted lines, with 'anl integral bracketA tofwhich' a supporting-frame 10 for my slotwa1l` bracing-finger is-show'n rigidlysecured as the tachmenaj A, holder table 'B is indicated, 'withfa' portion rotary cutter the section of said work holder shown in 2 indicatingan ordi# nary feed screw C by which step-by-step movements are 'imparted thereto in the direcv tion of the arrowas determined bythe spac- 1ng of the series of the slots to be cut by successive transverse movements of they cutter `D; and the latter bein mounted on a carriage JE suitably guided uponthe, frame A.l

It will be understood that the essential operatively y A slotting machine features thusV vindicated Y.

provide for effecting stepped slot-cutting movements of the cutter D cross-wise oftheA blank C. My invention consists merely in providing an automatically operated slot" wall bracing-finger whereby a newly formed` tooth or slot-wall will be supported against the incidental lateral strain of the cutter so as to avoid possible breaking-down of a'slenderfwall, and insure. perfection in the work.

My slot-wall bracing-finger, as shown, conslsts `of a slot-engaging member' 11 the down-turned tip .12 of which is adapted' to enter into .a cut slot and extend along the length of the latter in contact with the solid instal iianking it; this member having a shank portion 13 which is adjustably secured tothe body portion '14 of the nger by means of an adjusting screw 15 and set screw 16 as indicated.",This body portion means of upon the 14, as shown, has a pivot end b an operating arm 21;- e movement of the finger being controlled by a cam device 22 fixed to the cutter carriage E.

' The yautomatic operation of my slot-wall bracingger ap lied as above set forth is 'as follows: The dn ger tip-1 2 is laccurately vset to space it from the p ath of the cutter D a distance equal to the' spacing of the v slots being successively "cut in the blank C by vthe transverse reciprocationsl of said cutter.' After the first slot has been cut, the.

withdrawingmovement of the cutter car?.

izzed cam device 22 un ion to 'permit the'r stepping forward' "movement required. prelimina .Y .to'ithe' nentslot-cut- 4ting movement. [Be ore the cutter begins to 0f a bar blank o indicated there@ mits-thefinger toop intothe as'tcut slot, thus providing a positiveA support or brace for the slender tooth or wall formed by the new cut; and this action is.

automatically repeated for each cutting operationl so that required perfectness of the v lined in the claims. a

What I claim is:

1. In combination with al slotting machine comprising a supporting frame and a work holder and rotary-cutter carrier relatively movable thereon t'o eect stepped cutting movements transversely of the work holder; a movably mounted slot-wall bracing-finger mounted on vthe frame rearwardly of the cutter path, and means for automatically moving said hracing-nger into a .previously cut'slot preliminary to each succeeding slot-cutting movement and withdrawing the same preliminary to each step movement.

2. In combination with a slottin'g machine comprising a sup]g ortingV frame, a. work holder -havinga longitudinally step* I by-step movement, and a rotary-cutter car.

rier having a reciprocating transverse movement during each rest period of the workv holder;"a slot-wall bracing-finger mounted on the frame rearward of the cutter path.

and movable toward and away from the worh holder, and means for automatically movmg said bracing finger into a previously cut slot preliminary to each succeeding slot,

tary-cutter carrier having a reciprocating transverse movement, during each rest period of the work-holder, a slot-wally bracing-finger mounted on-said' frame rearward f lof the cutter path to move toward and away fromv the work holder, and a lingeroperatin-g device fixed to said cutter carrier and adapted the reverselyposition said linger during the restand moving periods of the work holder.'

In testimony whereof I ax my signature.. n 

